Air-preheater for locomotives and the like



F. LJUNGSTROM AND I. BROBERG.

AIR PREHEATER FOR LOCOMOTIVES ANDTHE LIKE. APPLICATION FILED APR. 2. 1919.

2 SHEETS-SHEET I- Patented Nov. 30, I

F. LJUNGSTRUM AND I. BROBERG. AIR PREHEATER FOR LOCOMOTIVES AND THELIKE.

ooooooooso oooooooo 0 aoaooo ooooooooo 2 SHEETSSHEET 2.

,UNITED STATES PATENT OFFICE.

' FREDRIK IJUNGSTROM, OF BREVIK, LIDINGON, AND ISIDOR BROBERG, OF Sm SATRA, LIDINGON,

SWEDEN, ASSIGNORS TO AKTIEBOLAGET LJUNGSTBOM ANGTURBIN, OF STOGKHOLM, SWEDEN, A CORPORATION.

Specification of Letters Patent.

Patented Nov. 30, 1920.

Application filed April 2, 1919. Serial No. 287,023.

To all whom it may concern:

Be it known that we, FREDRIK LJUNG- s'rRoM, a subject of the King of Sweden, re siding at Brevik, Lidingon, Sweden, and IsIoon Bnonnno, a subject of the King of Sweden, residing at Tallhyddan, Skarsatra, Lid-ingon, Sweden, have invented certain new and useful Improvements in Air-Preheaters for Locomotives and the like, of which the following is a specification.

The present invention relates to a special arrangement of air-preheater for locomotives, locomobiles etc. and has for its purpose to provide a fuel economizer wherein the tubes are disposed so as to insure a rigid and simple construction capable of being effectively cleansed out by a suitable form of steam-sweeping device connected therewith.

To this end, the invention primarily consists therein, that the longitudinally disposed tubes of the preheater, which are placed partly, or wholly, in front of the boiler in such manner that sweeping and removal of the boiler tubes may be effected without hindrance from the preheater, are arranged beneath the smoke box.

An embodiment of the invention is shown by way of example in the accompanying drawings,.in which Figure 1 represents a longitudinal section of the smoke box of a locomotive provided with a preheater according to the invention. Fig. 2 is a front view of the same partly in section, a preferableform of a steam blowing device for the cleansing of the preheatertubes being shown in connection therewith. Fig. 3 shows an alternate form of the steam cleansing device.

Referring to the drawing, 1 is the smoke box of a locomotive, the same being dividedinto two compartments 2 and 3 by means of a partition 1. The air-preheater which according to the invention is of rectangular shape, and comprises the pre-heater tubes 5, is disposed underneath the smoke box 1, as will be seen from the drawing. The combustion gases issuing from the boiler tubes 6 into the compartment 3 of the smoke box 1 upon striking the partition 1 move downward past and along the tubes 5 of the preheater and thence upward into the compartment 2 of the smoke box from which the gases are driven off through the smoke stack 7. The soot and coal-dust accumulating at the bottom of the preheater are removed through the outtake 8. The air is forced into the preheater tubes 5 by the air pressure caused by the forward movement of the locomotive, and it then passes through the tubes 5 and a duct 9 to the furnace of the boiler.

The form of tube cleansing device shown in Fig. 2 of the drawing comprises a stop cock 9 in a steam-supply pipe from which the branch conduits 10 lead the steam to four groups of steam pipes 11, which are provided with apertures on one or both'sides opposite the preheater tubes 5. The cleansing pipes being thus divided in a number of sets, only part of the preheater tubes need be swept at a time, as may be required.

The said cleansing device may be attached to the front or the rear wall, or-disposed in any suitable place of the preheater, or it may be movably arranged in the longitudinal direction of the preheater.

Where the preheater tubes need not be swept by sets, the simpler form of cleansing device shown in Fig. 3 may be employed. In this embodiment the steam is conducted through a central pipe 12 to the horizontal branch pipes 13 projecting between the rows of preheater tubes 5, the steam being forced out through apertures provided in the walls of said pipes 13 so as to sweep off the soot from the preheater tubes 5. It is evident,

that this form of cleansing device, too, may be either rigidly or movably arranged in the manner described with reference to Fig. 2. v

What we claim as new and desire to secure by Letters Patent of the United States is i- 1. In locomotives or the like having a boiler and a smoke box, a preheater arranged longitudinally in front of the boiler and beneath the smoke box and consisting of a" plurality ,of longitudinally disposed tubes.

2. A. preheateras claimed in claim 1, provided with an accumulator of coal dust.

3. A preheater as claimed in claim 1, combined with a pipe-system provided with a number of holes and connected to a steam supply, the said pipe-system beingarranged in the longitudinal direction of the tubes.

. 4. A preheater as claimed in claim 1, having a rectangular shape transversely to the longitudinal direction of the-boiler. v

5. A preheater as claimed in claim 1, in combination with partitions, inserted in the smoke box and forcing the combustion gases downward to the preheater, the said gases In Wit whereof We have hereunto Set then moving along the preheater, and finally our hands in the presence of two witnesses.

escaping upward into the smoke stack; FREDRIK LJ UN GSTRGM.

6. A preheater as claimed in claim 1, in ISIDOR BROBERG. 5 combination with a pi e, situated below the Witnesses:

tubes and connecting t e preheater with the v P. H. BERoRoTH,

furnace. GRETA PRIM. 

